Stack enlisted in the Federal Military before the Bug War and went to the Fleet Academy on Tereshkova Base for training. During this time, Stack shared quarters with Carmen Ibanez and the two developed a friendship often racing to Shuttles to Luna Base to see who would fly them.
Sometime during the early years of the First Bug War, Stack was deployed to active service and after the Invasion of Planet P, Stack was promoted to Lieutenant and stationed onboard the newly commissioned Athena as a pilot. The ship was under the command of Captain Carmen Ibanez and Stack Lumbrezer was on duty during the Second Battle of Klendathu when the ship's Dropships were deployed.
- Starship Troopers (1997 film)